Question

An equiconvex lens of focal length \( f \) is cut into four parts as shown in the diagram. The focal length of each part is

• A. \( \frac{f}{4} \)
• B. \( \frac{f}{2} \)
• C. \( \frac{f}{8} \)
• D. \( f \)

Hint:

For symmetric cutting of a lens, the focal length of each part is reduced by a factor of 2.

Answer 1

The Correct Option is B

When an equiconvex lens is cut into parts, each part will have half the focal length of the original lens. This is because the focal length of a lens is inversely proportional to its curvature.